How can I create a one-pixel gap below an image in an HTML email using Outlook 2010?

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One way to create a one-pixel gap below an image in an HTML email using Outlook 2010 is to add some inline CSS to the image tag. Here's an example:

<img src="image.jpg" style="display:block; margin-bottom:1px;" />

The display:block attribute ensures that the image is treated as a block-level element, allowing the margin-bottom attribute to create a gap below the image. You can adjust the value of the margin-bottom attribute to increase or decrease the size of the gap as needed.

Keep in mind that different email clients may interpret CSS differently, so it's always a good idea to test your emails across multiple platforms to ensure they look the way you intend them to.